it’s not an official combine invite thing, it’s an extra combine arm to be used as needed. If some one pulls out of throwing, gets hurt, or they need extra tosses and don’t want to over work guys. A decent few qbs these days elect not to throw at the combine. Instead throwing in friendly confines to guys they know and can rely on. But this generally isn’t known until right before the combine or during. So you can end up in a position where you need a couple extra arms to do a full work out just to keep the wrs busy. It is not like he’s going to have his performance graded and considered with draft prospects. It’s the most basic level of exposure to the nfl scouts you can get. It doesn’t hurt him to take it, but he also isn’t riding it any place. It’ll still be if he can get reps in the ufl and the weight of the partial pre season game he had, that decides if he gets an invite to camp with some one. Or if there’s a mad rash of qb injuries.